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Re: Anyone Tried a Removable PEI Bed?

Posted: Fri May 20, 2016 9:28 am
by ttabbal
I'm currently using a Zebra plate on my Mini. It works well, but isn't quite as nice as PEI. I keep using it because my PEI is damaged and I don't want to deal with the adhesive yet. I'll probably buy a new bed from ITW with the PEI installed, so I can take my time cleaning up the old one and not rush to limit downtime.

I like the vacuum idea as swapping plates would be super simple, and it would hold plates with a little warp nice and flat. Downside is I don't have a vacuum pump, but that's solvable. One nice thing about vacuum, thin plates are no problem. With magnets, you need enough thickness to machine a spot to put the magnets in. Wishing I had a CNC to try making one now...

Re: Anyone Tried a Removable PEI Bed?

Posted: Fri May 20, 2016 6:54 pm
by moejt
I've found another maker I'm working with now to try and get the plate machined.

And yeah, it would be universal. Larger up font cost but it would work with any plate.

The work around with using Magnets is to use adhesive on the bottom of the PEI . They would stick out... But you could machine recesses unto the heated mounting plate. But a lot of Magnets are expensive and I would want to use a lot...

Re: Anyone Tried a Removable PEI Bed?

Posted: Thu Jun 23, 2016 4:50 pm
by billyd
I get great results on my removable bed system with 1/16" thick PEI on 1/8" thick glass and 12x12 3m tape (same as Lulzbot uses). No problems with bowing. I have 100's of prints on it and the PEI is still perfect. It helps that I can instantly remove the glass/pei bed and work on removing the part from the PEI away from the machine and unobstructed. So it's easier to avoid damaging the PEI on well stuck prints.

Re: Anyone Tried a Removable PEI Bed?

Posted: Sat Dec 31, 2016 1:02 am
by CoParaTech
So has anyone tried the 1/16" PEI on the existing bed with the stock 3M adhesive? If that would stop the bubbling, wouldn't that be the easiest fix?

Re: Anyone Tried a Removable PEI Bed?

Posted: Sat Dec 31, 2016 7:15 pm
by kcchen_00
A removable PEI sheet could help with part removal...

Re: Anyone Tried a Removable PEI Bed?

Posted: Sat Dec 31, 2016 7:24 pm
by Daniel
I installed a PEI sheet on the buildtak flexplate system, it changed my (3d printer) life !

Re: Anyone Tried a Removable PEI Bed?

Posted: Sun Jan 01, 2017 1:23 am
by CoParaTech
Yes, Daniel, I was curious to see how that went. Did you use the standard Lulzbot PEI sheet, which I think is 0.25mm thick?

Re: Anyone Tried a Removable PEI Bed?

Posted: Sun Jan 01, 2017 7:09 pm
by Daniel
Nop, I used one 0.040" from mc master carr : https://www.mcmaster.com/#8685k41
The original from lulzbot is only 0.010" :o

I think the 0.04 is a little thick, I'll try to buy a 0.02 or 0.03 next time, but it works. The lulzbot PEI sheet should work fine too, thinner is the sheet, more flexible will be the system !

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Re: Anyone Tried a Removable PEI Bed?

Posted: Mon Jan 02, 2017 4:40 pm
by suntorn
moejt wrote:I have come to love PEI. A well maintained and well cleaned/sanded PEI sheet has unparalleled stick.

Recently I have been experimenting with other build plates such as Geckotek. I love the idea of Geckotek and its removable flexible plate but after the first few prints it loses its stick as the coating cures more. (I've been in contact with the creator Brad and the plate is working as intended and he is also seeing the adhesion issues that I am experiencing. Hopefully future versions will have the performance I need).

Anyways, So i'm back to PEI because I can obtain better stick. However I hate part removal of the PEI. I make and sell a lot of costume props which are required to look perfect, thus I need perfect bed adhesion. This requires me to often "over stick" a part on the PEI for large prints just so a corner doesnt warp slightly.

This isnt the problem... The problem is when you go to remove the part (yes I use proper procedure, IPA soak, I take my time and the bed is set between 50-60C). But even with the best intentions and being careful, you still end up with bubbling of the PEI sheet as it pulls. Not a major issue but man is it annoying.

All this to say -> PEI is the perfect build plate material except for its inability to stick well to its sub plate.

This brings me to my next idea. Why bother with adhesion? Has anyone tried to buy a 1/8" or 1/4" thick PEI sheet and use it as a removable bed? There would be no bubbling as the bed doesn't need to be "glued" down.

Anyone tried this? What would be the issues that you'd run into? Flatness? I've never messed with PEI in its raw form, I assume its pretty rigid? As in a 1/8" sheet would not flex (i've seen people talk about scoring and snapping PEI sheets). Why are more people not doing this?
Just get a thicker sheet of PEI. I use an 1/8 thick sheet, stuck down with 3m tape. Never bubbles, still perfect 1 year later. I also use a 3/8" wood chisel to pry parts off the bed, and it works phenomenally! The leverage works the part free, just keep the flat side up and use the bevel to slowly pop the part away. The glass will not break if you have a 1/8" thick PEI sheet! :-) I print with all materials, and this is the jackpot! !!!pro tip!!! :-)

Re: Anyone Tried a Removable PEI Bed?

Posted: Mon Jan 02, 2017 4:56 pm
by suntorn
I used to experience bubbles like that when I first got my taz and they used PET sheets on their beds. I was having issues with the prints sticking to the bed and tearing of the pet also. So I ordered a 100$ printinz 12" taz build plate and clipped out to my bed. It worked ok, for about 3 prints, then nothing would stick, and I found myself back at square one. I did some research and came to PEI. When I went online to purchase some they apparently were having a shortage problem from the extreme demand that PEI recently fell into. So I went to amazon.com and the only reasonable thing I could find was a 12x24" x1/8" thick piece. I repeat I ordered 1/8 inch thick PEI. I scored it in the middle with a utility knife and square on both sides and snapped it into 2 pieces so I would have a spare (1 year later and still using first one!). then using double sided 3m, I stick it to the bed.
After using this for a year, I never have to worry about any filament coming loose, air bubbles are non-existent, no tearing/ripping, heat bed works same as with thinner PEI. Of course you still need to use a glue stick, but this stuff is indestructable!
Happy Printing,
Sun